Squashed commit of the following:

commit 5b11756af6
Author: netscrawler <mariarthyjamesoo@gmail.com>
Date:   Thu Jul 4 00:44:15 2024 +0300

    v0.1

commit c99f477e35
Author: netscrawler <mariarthyjamesoo@gmail.com>
Date:   Sun Jun 30 20:44:53 2024 +0300

    v0.0.6

internal/lib/logger/handlers/slogdiscard/slogdiscard.go

@@ -0,0 +1,36 @@
+package slogdiscard
+
+import (
+	"context"
+	"golang.org/x/exp/slog"
+)
+
+func NewDiscardLogger() *slog.Logger {
+	return slog.New(NewDiscardHandler())
+}
+
+type DiscardHandler struct{}
+
+func NewDiscardHandler() *DiscardHandler {
+	return &DiscardHandler{}
+}
+
+func (h *DiscardHandler) Handle(_ context.Context, _ slog.Record) error {
+	// Просто игнорируем запись журнала
+	return nil
+}
+
+func (h *DiscardHandler) WithAttrs(_ []slog.Attr) slog.Handler {
+	// Возвращает тот же обработчик, так как нет атрибутов для сохранения
+	return h
+}
+
+func (h *DiscardHandler) WithGroup(_ string) slog.Handler {
+	// Возвращает тот же обработчик, так как нет группы для сохранения
+	return h
+}
+
+func (h *DiscardHandler) Enabled(_ context.Context, _ slog.Level) bool {
+	// Всегда возвращает false, так как запись журнала игнорируется
+	return false
+}

internal/lib/logger/handlers/slogpretty/slogpretty.go

@@ -0,0 +1,98 @@
+package slogpretty
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+	stdLog "log"
+	"log/slog"
+
+	"github.com/fatih/color"
+)
+
+type PrettyHandlerOptions struct {
+	SlogOpts *slog.HandlerOptions
+}
+
+type PrettyHandler struct {
+	opts PrettyHandlerOptions
+	slog.Handler
+	l     *stdLog.Logger
+	attrs []slog.Attr
+}
+
+func (opts PrettyHandlerOptions) NewPrettyHandler(
+	out io.Writer,
+) *PrettyHandler {
+	h := &PrettyHandler{
+		Handler: slog.NewJSONHandler(out, opts.SlogOpts),
+		l:       stdLog.New(out, "", 0),
+	}
+
+	return h
+}
+
+func (h *PrettyHandler) Handle(_ context.Context, r slog.Record) error {
+	level := r.Level.String() + ":"
+
+	switch r.Level {
+	case slog.LevelDebug:
+		level = color.MagentaString(level)
+	case slog.LevelInfo:
+		level = color.BlueString(level)
+	case slog.LevelWarn:
+		level = color.YellowString(level)
+	case slog.LevelError:
+		level = color.RedString(level)
+	}
+
+	fields := make(map[string]interface{}, r.NumAttrs())
+
+	r.Attrs(func(a slog.Attr) bool {
+		fields[a.Key] = a.Value.Any()
+
+		return true
+	})
+
+	for _, a := range h.attrs {
+		fields[a.Key] = a.Value.Any()
+	}
+
+	var b []byte
+	var err error
+
+	if len(fields) > 0 {
+		b, err = json.MarshalIndent(fields, "", "  ")
+		if err != nil {
+			return err
+		}
+	}
+
+	timeStr := r.Time.Format("[15:05:05.000]")
+	msg := color.CyanString(r.Message)
+
+	h.l.Println(
+		timeStr,
+		level,
+		msg,
+		color.WhiteString(string(b)),
+	)
+
+	return nil
+}
+
+func (h *PrettyHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
+	return &PrettyHandler{
+		Handler: h.Handler,
+		l:       h.l,
+		attrs:   attrs,
+	}
+}
+
+func (h *PrettyHandler) WithGroup(name string) slog.Handler {
+	// TODO: implement
+	return &PrettyHandler{
+		Handler: h.Handler.WithGroup(name),
+		l:       h.l,
+	}
+}

internal/lib/logger/sl/sl.go

@@ -0,0 +1,12 @@
+package sl
+
+import (
+	"log/slog"
+)
+
+func Err(err error) slog.Attr {
+	return slog.Attr{
+		Key:   "error",
+		Value: slog.StringValue(err.Error()),
+	}
+}

internal/lib/rateExtract/rateExtract.go

@@ -0,0 +1,177 @@
+package rateExtract
+
+import (
+	"compress/gzip"
+	"converter/internal/domain/models"
+	"encoding/xml"
+	"fmt"
+	"io"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"golang.org/x/text/encoding/charmap"
+)
+
+type resultType struct {
+	XMLName xml.Name `xml:"ValCurs"`
+	Valute  []struct {
+		NumCode  string `xml:"NumCode"`
+		CharCode string `xml:"CharCode"`
+		Nominal  string `xml:"Nominal"`
+		Name     string `xml:"Name"`
+		Value    string `xml:"Value"`
+	} `xml:"Valute"`
+}
+
+type cacheKeyType struct {
+	CurrencyId string
+	Date       string
+}
+
+type cacheResultType struct {
+	Rate float64
+}
+
+var urlTemplate string = "https://www.cbr.ru/scripts/XML_daily.asp?date_req=%s"
+
+var cache map[cacheKeyType]*cacheResultType
+
+func GetExchangeRate(currencyId string) (models.VunitRate, error) {
+	date := time.Now()
+	if cache == nil {
+		cache = map[cacheKeyType]*cacheResultType{}
+	}
+
+	reqDate := fmt.Sprintf("%02d/%02d/%d", date.Day(), date.Month(), date.Year())
+
+	cacheKey := cacheKeyType{CurrencyId: currencyId, Date: reqDate}
+
+	cacheResult, exists := cache[cacheKey]
+
+	if !exists {
+
+		url := fmt.Sprintf(urlTemplate, reqDate)
+
+		req, err := http.NewRequest(http.MethodGet, url, nil)
+		if err != nil {
+			return models.VunitRate{}, err
+		}
+
+		req.Header.Add("accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7")
+		req.Header.Add("accept-encoding", "gzip, deflate, br")
+		req.Header.Add("accept-language", "en-US,en;q=0.9,ru;q=0.8")
+		req.Header.Add("cache-control", "max-age=0")
+		req.Header.Add("user-agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36")
+
+		client := &http.Client{}
+
+		resp, err := client.Do(req)
+		if err != nil {
+			return models.VunitRate{Currency: currencyId, Rate: 0}, err
+		}
+
+		defer resp.Body.Close()
+
+		var reader io.ReadCloser
+
+		switch resp.Header.Get("Content-Encoding") {
+		case "gzip":
+			reader, err = gzip.NewReader(resp.Body)
+			if err != nil {
+				return models.VunitRate{Currency: currencyId, Rate: 0}, err
+			}
+			defer reader.Close()
+		default:
+			reader = resp.Body
+		}
+
+		xml := xml.NewDecoder(reader)
+
+		xml.CharsetReader = func(charset string, input io.Reader) (io.Reader, error) {
+			switch charset {
+			case "windows-1251":
+				return charmap.Windows1251.NewDecoder().Reader(input), nil
+			default:
+				return nil, fmt.Errorf("unknown charset: %s", charset)
+			}
+		}
+
+		result := &resultType{}
+
+		err = xml.Decode(result)
+		if err != nil {
+			return models.VunitRate{Currency: currencyId, Rate: 0}, err
+		}
+
+		for _, resultRow := range result.Valute {
+
+			if resultRow.CharCode != currencyId {
+				continue
+			}
+
+			resultRow.Value = strings.Replace(resultRow.Value, ",", ".", 1)
+
+			rate, err := strconv.ParseFloat(resultRow.Value, 64)
+			if err != nil {
+				return models.VunitRate{Currency: currencyId, Rate: 0}, err
+			}
+
+			nominal, err := strconv.ParseInt(resultRow.Nominal, 10, 64)
+			if err != nil {
+				return models.VunitRate{Currency: currencyId, Rate: 0}, err
+			}
+
+			cacheResult = &cacheResultType{Rate: rate / float64(nominal)}
+
+			cache[cacheKey] = cacheResult
+
+		}
+
+	}
+	return models.VunitRate{Currency: currencyId, Rate: float32(cacheResult.Rate)}, nil
+
+}
+
+//func Convert(from string, to string, value float64, date time.Time) (float64, error) {
+//
+//	if from == to {
+//		return value, nil
+//	}
+//
+//	if value == 0 {
+//		return 0, nil
+//	}
+//
+//	result := value
+//
+//	if from != CurrencyRUB {
+//
+//		exchangeRate, err := GetExchangeRate(from, date)
+//		if err != nil {
+//			return 0, err
+//		}
+//
+//		result = result * exchangeRate
+//
+//	}
+//
+//	if to != CurrencyRUB {
+//
+//		exchangeRate, err := GetExchangeRate(to, date)
+//		if err != nil {
+//			return 0, err
+//		}
+//
+//		result = result / exchangeRate
+//
+//	}
+//
+//	return (math.Floor(result*100) / 100), nil
+//
+//}
+//
+//func main() {
+//	fmt.Println(GetExchangeRate(CurrencyUSD, time.Now()))
+//}